CN108825234A - Gob side entry retaining structure and method under the conditions of a kind of pit mining girdle - Google Patents
Gob side entry retaining structure and method under the conditions of a kind of pit mining girdle Download PDFInfo
- Publication number
- CN108825234A CN108825234A CN201810386083.0A CN201810386083A CN108825234A CN 108825234 A CN108825234 A CN 108825234A CN 201810386083 A CN201810386083 A CN 201810386083A CN 108825234 A CN108825234 A CN 108825234A
- Authority
- CN
- China
- Prior art keywords
- anchor cable
- top beam
- tunnel
- goaf
- girdle
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C41/00—Methods of underground or surface mining; Layouts therefor
- E21C41/16—Methods of underground mining; Layouts therefor
- E21C41/18—Methods of underground mining; Layouts therefor for brown or hard coal
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D15/00—Props; Chocks, e.g. made of flexible containers filled with backfilling material
- E21D15/14—Telescopic props
- E21D15/44—Hydraulic, pneumatic, or hydraulic-pneumatic props
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D17/00—Caps for supporting mine roofs
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
Abstract
The present invention relates to gob side entry retaining structure and methods under the conditions of a kind of pit mining girdle, belong to coal mine production technique field, advance reinforcement branch protecting assembly include along tunnel move towards close to goaf the first anchor cable and far from goaf the second anchor cable, the first anchor cable by along tunnel move towards extend and it is smooth be arranged in be caving line position move towards steel band connection；Barrier assembly includes spoil bag and outside is provided with rhombus net；Roadway support component includes the first top beam and the second separate top beam moved towards along tunnel close to goaf, the lower section of first top beam, which is located on the inside of rhombus net, is arranged at intervals with closely spaced hydraulic prop, and the lower section of the second top beam, which is located on the inside of coal wall, is arranged at intervals with the big hydraulic prop of spacing.The present invention has while eliminating stress concentration above approaches the working surface coal body, can reduce the security risk in terms of mine disaster, and cheap, easy for construction, have the advantages that apparent safety economy benefit.
Description
Technical field
The present invention relates to gob side entry retaining structure and methods under the conditions of a kind of pit mining girdle, belong to coal mine exploitation skill
A kind of structures and methods of art field more particularly to top plate from the gob side entry retaining that collapses.
Background technique
For the exploitation of this disposable energy of coal, each state all continuous research to can Resource recovery to greatest extent,
Coal body is avoided to lose, wherein gob side entry retaining is proposed in last century by Germany and Britain, ties up at coal working face rear along mined out area edge
Former stope drift active workings are protected, next section for is left the tunnel of a upper section again supporting using certain technological means and is used,
Belong to one of no coal pillar mining technology mode, connects anxiety with reducing tunnelling amount, alleviating, saving driving expense,
Overall economic efficiency is improved, coal all recycling, the benefit for extending mine life, improving social benefit are realized, due to staying along sky
Lane has broad sense, therefore is preferentially used by more mine.
In edge air gallery technology, intensity is the factor for needing emphasis to consider, one is control to top plate, avoids top plate
It is influenced excessive sinking occur or even be caving by top mine pressure, the other is the design of supporting divider wall, it is ensured that along empty lane
Road and top plate provide reliable support, and need to strictly be sealed to goaf, and gas leakage is avoided to cause safety accident.
Successively occur slabbing form, spoil way of stacking, masonry wall method, high water about isolated wall efficiently to fill
And cast-in-place concrete, currently, in-situ concrete wall due to it is adaptable it is wide, bearing capacity is high, is capable of forming and enough cuts top
Intensity, safe and reliable advantage, it is considered to be ideal partition wall method, but that there are still engineering costs is relatively high, construction
Not the problem of complex and intensity rate of climb does not adapt to high yield and high efficiency mine working face.
Control for top plate, current edge air gallery technology are considering that top plate is reinforced to mention in mine pressure influence in top
When high top plate integrality, often ignore the smooth degree on the circumscribed top of wall, existing top plate is caused to be difficult to after turn is broken in a zigzag
With supporting divider wall formed it is strict be bonded, prevent the isolation effect in goaf from reaching design requirement, is easy the presence of safety
Hidden danger.Therefore, realized such as how lower cost and simple construction intensity and it is safe while to meet be gob side entry retaining skill
Art problem to be solved in pit mining.
Summary of the invention
To solve the above technical deficiency, the present invention provides gob side entry retaining knots under the conditions of a kind of pit mining girdle
Structure and method can reduce the security risk in terms of mine disaster while eliminating stress concentration above approaches the working surface coal body,
And it is cheap, easy for construction, there is apparent safety economy benefit.
Technical scheme is as follows：Gob side entry retaining structure under the conditions of a kind of pit mining girdle, including in advance plus
Clamped protecting assembly, barrier assembly and roadway support component,
The advance reinforcement branch protecting assembly includes the first anchor cable and the second anchor cable that setting is moved towards along tunnel, and the first anchor cable is close to be adopted
Dead zone, far from goaf, the first anchor cable is connected the second anchor cable by moving towards steel band, it is described move towards steel band along tunnel move towards extension and
Smooth setting is being caving line position；
The barrier assembly includes the spoil bag between goaf and tunnel, is provided with rhombus net outside spoil bag；
The roadway support component includes the first top beam and the second top beam that setting is moved towards along tunnel, and the first top beam is close to mined out
Area, for the second top beam far from goaf, the lower section of the first top beam, which is located on the inside of rhombus net, is arranged at intervals with hydraulic prop, the
The lower section of two top beams, which is located on the inside of coal wall, is arranged at intervals with hydraulic prop, the monomer hydraulic branch below the first top beam
The spacing of column is less than the spacing for the hydraulic prop being located at below the second top beam.
Technical solution of the present invention further includes：The spacing of the hydraulic prop being located at below the first top beam is to be located at
The half of the spacing of hydraulic prop below second top beam.
Technical solution of the present invention further includes：The roadway support component includes tunnel strengthening supporting part, and the tunnel adds
Strong supporting part includes that spaced apart steel I-beam is moved towards along tunnel, and the axis of the steel I-beam is handed over the axis for moving towards steel band
Mistake setting.
Technical solution of the present invention further includes：The steel I-beam is located at the middle part in tunnel, and steel I-beam is solid by anchor cable
It is scheduled on top plate, the spacing of adjacent steel I-beam is 1600~1900mm.
Technical solution of the present invention further includes：The anchor cable diameter of first anchor cable and the second anchor cable is 22mm, and anchor cable is long
Degree is 6300~8300mm, and array pitch is 2000*1800mm between anchor cable.
The present invention also provides gob-side entry retaining methods under the conditions of a kind of pit mining girdle, mainly include the following steps that：
Step 1 moves towards to construct two rows of anchor cables to tunnel progress advance reinforcement supporting, wherein row's anchor cable is close to mined out along tunnel
Area's arrangement, in addition row's anchor cable is arranged far from goaf, and the anchor cable close to goaf side, which is used, moves towards the flat of extension along tunnel
It is whole be arranged in be caving line position move towards steel band connection；
Step 2 presses stubble with spoil bag at force piece rear in layer, connects that top is tight, builds gangue bag wall；
Step 3 forms gear cash truss using hydraulic prop and rhombus net and carries out supporting, takes intensive list against pack wall
Body hydraulic prop does strengthening supporting plus setting top beam, is propped up using loose hydraulic prop plus setting top beam against coal wall side
Shield.
Technical solution of the present invention further includes：It further include that I-shaped is arranged in the middle part of tunnel along tunnel trend in the step 3
Girder steel does strengthening supporting, and the steel I-beam strengthening supporting and cable bolting form complementary type supporting.
Technical solution of the present invention further includes：Strengthening supporting is done using two column of a beam against pack wall in the step 3,
Supporting is done using one beam of a column against coal wall side.
The beneficial effects of the invention are as follows：Firstly, selecting spoil bag formation divider wall in terms of supporting divider wall, can reduce
Cost and construction can be facilitated, secondly, in order to ensure using the intensity of spoil bag and staying the safety in lane, in advance support
It is middle that along tunnel, two rows of anchor cables are set, and steel band connection is moved towards in the anchor cable use that will be close to goaf side, and it is smooth to move towards steel band
Smooth auxiliary breaking effect can be played to top plate being caving at line in roof caving line position, one by being arranged, it is ensured that top plate
The smooth degree on top is cut, so that it is guaranteed that staying the stringent sealing in lane intensity and goaf, two can reliably prop up top plate
Support, and the supporting construction for later period pack wall provides cooperation；In addition, forming gear cash truss using rhombus net and hydraulic prop
Supporting is provided for pack wall, and in the supporting construction for using different structure close to pack wall and coal wall side, tunnel is being met with this
With isolation supporting intensity requirement when with reduce cost and construction complexity.
Detailed description of the invention
Fig. 1 is floor map of the invention.
Fig. 2 is partial cutaway schematic of the invention.
In figure, the 11, first anchor cable, the 12, second anchor cable, 13, move towards steel band, the 21, first top beam, the 22, second top beam, 3, work
Word girder steel, 4, hydraulic prop, 5, rhombus net, 6, spoil bag, 7, original steel band.
Specific embodiment
Below in conjunction with attached drawing, the invention is further illustrated by the examples.
As depicted in figs. 1 and 2, gob side entry retaining structure and method under the conditions of pit mining girdle of the invention, are being eliminated
While stress is concentrated above approaches the working surface coal body, reduce the security risk in terms of mine disaster, there is apparent safety
Benefit, and production efficiency can be improved, it is easy to operate, it is cheap, stay the every km in lane to save more than 100 ten thousand yuan of expense compared with whitewashing.
Gob side entry retaining structure mainly includes three parts, advance reinforcement supporting group under the conditions of pit mining girdle of the invention
Part, barrier assembly and roadway support component.
Wherein, advance reinforcement branch protecting assembly includes two rows of anchor cables that arrangement is moved towards along tunnel, and the first anchor cable 11 is walked along tunnel
It is disposed adjacent to goaf side to by moving towards the connection of steel band 13, the second anchor cable 12 is arranged in along tunnel trend far from goaf
Side, that is, the width direction by two rows of anchor cables along tunnel is arranged, and thus can provide on the whole tunnel reliable supporting.
It moves towards steel band 13 and moves towards to be arranged in be caving at line along tunnel, and steel band 13 will be moved towards and be arranged to flat configuration, thus
It can play the role of the smooth of auxiliary to the fracture of top plate, it is smooth to ensure to cut top, to avoid due to cutting top, turn is caused in a zigzag
Isolation and the poorly sealed close problem in goaf, with this come avoid as goaf it is poorly sealed caused by the peace such as gas leakage
Full hidden danger；In addition, certain booster action can be provided advance support anchor cable, also to increase the supporting role to top plate.
In the embodiment of the present invention, the specification and parameter of supporting anchorage cable are：Anchor cable diameter 22mm, length 6300-8300mm；
Array pitch 2000mm*1800mm between anchor cable.
Barrier assembly using spoil bag 6 build at, thus can facilitate construction while reducing cost, it is of the invention in,
Between goaf and tunnel, that is, force piece rear build 6 wall of spoil bag, 6 1.0~1.5m of width of spoil bag, more typically
2m width spoil bag 6 it is narrow, can save dress the spoil time, working efficiency can be improved, spoil bag 3 presses stubble in layer, connects
Top is tight, and the stringent sealing in goaf is thus ensured while reliable to top plate supporting.
Roadway support component includes supporting in gear cash truss and tunnel, wherein gear cash truss uses 4 He of hydraulic prop
Rhombus net 5 forms, and specifically, rhombus net 5 is wrapped in outside spoil bag 6, in 5 inside of rhombus net（Close to tunnel interior side）Again
Hydraulic prop 4 is placed, also, the first top beam 21 is arranged at the top of hydraulic prop 4 to ensure to connect top tightly.
Supporting includes moving towards the hydraulic prop 4 of setting far from one lateral edge tunnel of goaf and being located at single in tunnel
Second top beam 22 at 4 top of body hydraulic prop, wherein the compartment close to the hydraulic prop 4 in goaf is separate away from being less than
The compartment of the hydraulic prop 4 in goaf is away from pouring tunnel with this come roof caving rock when avoiding periodic weighting.Specifically
Ground uses two column strengthening supporting of a beam close to goaf at pack wall, and one beam branch of a column is done against coal wall in the other side
Shield can ensure to reduce cost and construction complexity while staying lane integral strength.
Also in addition setting strengthening supporting specifically moves towards setting steel I-beam 3, work along tunnel in tunnel in tunnel
The axis of word girder steel 3 is parallel with span length, i.e., thus can be with cable bolting shape with advance reinforcement anchor cable in relationship is mutually perpendicular to
At complementary type supporting, the integral strength in lane is stayed in enhancing.In the present invention, steel I-beam 3 is fixed on top plate and placed in the middle using anchor cable
Arrangement, in addition, the overall effect that the line space design of adjacent steel I-beam 3 at 1800mm, thus can get.
Original steel band 7 is remained in tunnel, is moved towards arranged for interval along tunnel, is fixed on top plate using anchor pole.
Gob-side entry retaining method sequentially carries out according to the following steps under the conditions of pit mining girdle of the invention, first uses anchor
Rope and move towards steel band and carry out advance reinforcement supporting, build divider wall with spoil bag again later, and therewith using hydraulic prop and
Rhombus net carries out gear cash supporting, does last tunnel and strengthening supporting in tunnel thereafter.
Gob side entry retaining of the invention is easy for construction, cheap pack wall is utilized on the basis of original pack wall
The advantages of simultaneously, to spoil bag contract it is wide improve, to reduce the dress spoil time, improve work efficiency, ordinatedly, in order to keep away
Exempt from bring intensity after spoil bag becomes smaller to adversely affect, separately designs advance reinforcement supporting, gear cash supporting and roadway support,
While respective advance reinforcement, gear cash and roadway support are realized in each supporting, the concord connection of front and back is also taken into account, stays lane to improve
Intensity on the whole, thus can be formed while meeting using pack wall and staying lane intensity it is opposed flattened cut top, to ensure to adopt
The stringent sealing of dead zone, to can ensure that the intensity and safety for staying lane while realizing low cost, simple operations.
The above is only presently preferred embodiments of the present invention, not does limitation in any form to the present invention, all at this
Done any modifications, equivalent replacements, and improvements etc., should be included in protection scope of the present invention within the spirit and principle of invention
Within.
Claims (8)
1. gob side entry retaining structure under the conditions of a kind of pit mining girdle, it is characterised in that：Including advance reinforcement branch protecting assembly, every
From component and roadway support component,
The advance reinforcement branch protecting assembly includes the first anchor cable that setting is moved towards along tunnel（11）With the second anchor cable（12）, the first anchor
Rope（11）Close to goaf, the second anchor cable（12）Far from goaf, the first anchor cable（11）By moving towards steel band（13）Connection, it is described
Move towards steel band（13）It moves towards to extend along tunnel and smooth setting is being caving line position；
The barrier assembly includes the spoil bag between goaf and tunnel（6）, spoil bag（6）Outside is provided with rhombus net
（5）；
The roadway support component includes the first top beam that setting is moved towards along tunnel（21）With the second top beam（22）, the first top beam
（21）Close to goaf, the second top beam（22）Far from goaf, the first top beam（21）Lower section be located at rhombus net（5）Inside between
Every being provided with hydraulic prop（4）, the second top beam（22）Lower section be located on the inside of coal wall and be arranged at intervals with monomer hydraulic branch
Column（4）, it is located at the first top beam（21）The hydraulic prop of lower section（4）Spacing be less than be located at the second top beam（22）The list of lower section
Body hydraulic prop（4）Spacing.
2. gob side entry retaining structure under the conditions of a kind of pit mining girdle as described in claim 1, it is characterised in that：Institute's rheme
In the first top beam（21）The hydraulic prop of lower section（4）Spacing be located at the second top beam（22）The hydraulic prop of lower section
（4）Spacing half.
3. gob side entry retaining structure under the conditions of a kind of pit mining girdle as claimed in claim 1 or 2, it is characterised in that：Institute
Stating roadway support component includes tunnel strengthening supporting part, and the tunnel strengthening supporting part includes that spaced apart work is moved towards along tunnel
Word girder steel（3）, the steel I-beam（3）Axis and move towards steel band（13）Axis be staggered.
4. gob side entry retaining structure under the conditions of a kind of pit mining girdle as claimed in claim 3, it is characterised in that：The work
Word girder steel（3）Positioned at the middle part in tunnel, steel I-beam（3）It is fixed on top plate by anchor cable, adjacent steel I-beam（3）Spacing
It is 1600~1900mm.
5. gob side entry retaining structure under the conditions of a kind of pit mining girdle as claimed in claim 4, it is characterised in that：Described
One anchor cable（11）With the second anchor cable（12）Anchor cable diameter be 22mm, anchor cable length is 6300~8300mm, and array pitch is between anchor cable
2000*1800mm。
6. gob-side entry retaining method under the conditions of a kind of pit mining girdle using any of the above-described claim mainly includes following
Step：
Step 1 moves towards to construct two rows of anchor cables to tunnel progress advance reinforcement supporting, wherein row's anchor cable is close to mined out along tunnel
Area's arrangement, in addition row's anchor cable is arranged far from goaf, and the anchor cable close to goaf side, which is used, moves towards the flat of extension along tunnel
It is whole be arranged in be caving line position move towards steel band connection；
Step 2 presses stubble with spoil bag at force piece rear in layer, connects that top is tight, builds gangue bag wall；
Step 3 forms gear cash truss using hydraulic prop and rhombus net and carries out supporting, takes intensive list against pack wall
Body hydraulic prop does strengthening supporting plus setting top beam, is propped up using loose hydraulic prop plus setting top beam against coal wall side
Shield.
7. gob-side entry retaining method under the conditions of a kind of pit mining girdle as claimed in claim 6, it is characterised in that：The step
Further include arranging that steel I-beam does strengthening supporting in the middle part of tunnel along tunnel trend in rapid three, the steel I-beam strengthening supporting with
Cable bolting forms complementary type supporting.
8. gob-side entry retaining method under the conditions of a kind of pit mining girdle as claimed in claim 6, it is characterised in that：The step
Strengthening supporting is done using two column of a beam against pack wall in rapid three, supporting is done using one beam of a column against coal wall side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810386083.0A CN108825234A (en) | 2018-04-26 | 2018-04-26 | Gob side entry retaining structure and method under the conditions of a kind of pit mining girdle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810386083.0A CN108825234A (en) | 2018-04-26 | 2018-04-26 | Gob side entry retaining structure and method under the conditions of a kind of pit mining girdle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108825234A true CN108825234A (en) | 2018-11-16 |
Family
ID=64155576
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810386083.0A Pending CN108825234A (en) | 2018-04-26 | 2018-04-26 | Gob side entry retaining structure and method under the conditions of a kind of pit mining girdle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108825234A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109695454A (en) * | 2019-01-25 | 2019-04-30 | 河北工程大学 | The construction method of preliminary bracing is carried out in the constructing tunnel of high earthquake zone fracture area |
| CN111456734A (en) * | 2020-04-20 | 2020-07-28 | 北京中矿创新联盟能源环境科学研究院 | Coal mining method |
-
2018
- 2018-04-26 CN CN201810386083.0A patent/CN108825234A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109695454A (en) * | 2019-01-25 | 2019-04-30 | 河北工程大学 | The construction method of preliminary bracing is carried out in the constructing tunnel of high earthquake zone fracture area |
| CN111456734A (en) * | 2020-04-20 | 2020-07-28 | 北京中矿创新联盟能源环境科学研究院 | Coal mining method |
| CN111456734B (en) * | 2020-04-20 | 2021-02-23 | 北京中矿创新联盟能源环境科学研究院 | Coal mining method |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20181116 |
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| RJ01 | Rejection of invention patent application after publication |